不同种植方式对寒地粳稻籽粒灌浆动态的影响

The Dramatic Impacts of Different Planting Methods on Grain Filling of the Japonica Rice Varieties from Cold Zones

以垦稻12和垦稻31为材料,采用随机区组设计,应用Richards方程对旱直播(A1)、水稻垄畦栽培(A2)和常规栽培(A3)三种不同种植方式下的强弱势籽粒的灌浆过程进行拟合,并绘制不同种植方式下,强弱势籽粒灌浆速率曲线。结果表明,相对于CK,垄畦栽培方式起始生长势(R0)、最大灌浆速率(Gmax·_G)明显高于CK,强势籽粒活跃灌浆期(D)和达灌浆峰值的天数(Tmax·_G)均明显短于CK。旱直播和水稻垄畦栽培方式下,籽粒灌浆速率曲线上升部分的斜率明显高于CK,且最高点所对应的Tmax·_G早于CK。垦稻31的灌浆速率的启动时间早于垦稻12,灌浆速率峰值低于垦稻12。

This experiment takes The Kendao-12and Kendao-31are taken as materials in the experiment,and adopts the randomized-block design.Richards functions is used to fit the filling process of superior and inferior grains by direct seeding(A1),ridge cultivation(A2),and conventional cultivation(A3),the three different cultivation methods,and a filling curve of both superior and inferior grains by different cultivation methods has been made.Compared with CK,the initial growth(R0)and the maximum filling rate(Gmax·G)by ridge cultivation are obviously higher than these by CK,while D and Tmax·G both are fairly lower than these by CK,as shown by the results.By direct seeding and ridge cultivation,the mid and latter filling stage is obviously shorter than these by CK,as well as the average filling rate and contribution rate(assimilation rate)are apparently higher than these by CK at mid and latter stage.The slope of the grain filling curve's raising part is obviously higher than that by CK,with Tmax·G corresponding to the peak coming earlier than CK.Kendao-31starts grain filling earlier than Kendao-12,but its peak filling rate is lower than Kendao-12.